Bug 671466 Prevent persistence of disabled state of 'Try Again' button on error pages r=bz

docshell/resources/content/netError.xhtml

@@ -392,7 +392,7 @@
       </div>
 
       <!-- Retry Button -->
-      <button id="errorTryAgain" onclick="retryThis(this);">&retry.label;</button>
+      <button id="errorTryAgain" autocomplete="off" onclick="retryThis(this);">&retry.label;</button>
 
     </div>